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OBSERVATIONS ON THE BIONOMICS OF OVA AND MIRACIDIA OFFASCIOLA HEPATICALINN., IN EASTERN CANADA |
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Canadian Journal of Research,
Volume 17d,
Issue 10,
1939,
Page 205-211
Henry J. Griffiths,
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摘要:
The effect of temperature, light, darkness, and chemicals on the hatching of the eggs ofFasciola hepaticais discussed. Some malformations of the eggs of this parasite together with observations on the miracidia are recorded. A description of methods employed for attempted infestation of suspected snails is given. In no instance, however, were any specimens of the 11 species of snails exposed, proven to act as intermediate host forF.hepatica.
ISSN:1923-4287
DOI:10.1139/cjr39d-022
出版商:NRC Research Press
年代:1939
数据来源: NRC
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LACUSTRINE INVESTIGATIONS IN THE GASPÉ PENINSULA |
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Canadian Journal of Research,
Volume 17d,
Issue 10,
1939,
Page 212-224
A. J. M. Honeyman,
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PDF (711KB)
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摘要:
A study of the temperature variations in Ross Lake indicates that it is a typical "second order" lake. The seasonal variations are explicable in terms of the changes in air temperature and the resulting effects on temperature and density of the water. Thermal stratification is clearly indicated. Seasonal variations in the dissolved oxygen content of the water are largely dependent on temperature changes. The variations in acidity, alkalinity, and hydrogen ion concentration are dependent chiefly on temperature changes affecting solubility of carbon dioxide, and on the limy nature of the lake bottom. Analysis of the oxygen distribution indicates a eutrophic condition, but there is as yet insufficient quantitative information about the biological conditions to warrant definite conclusions.
ISSN:1923-4287
DOI:10.1139/cjr39d-023
出版商:NRC Research Press
年代:1939
数据来源: NRC
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